form 21-534ez

This post concerns the filling out of va form 21-534ez. On page 6 box 5 and 6 my father got a disability prior to his death in 1992. My mother applied for DIC and burial benefits and was denied in both cases. She also applied for a monument and was approved. In all three cases the same file number was attached to each document. This file number was also on his VA card. Is this the number that should go in box 6?